Expanding reamer



J. .I. JASPERSON..

EXPANDING REAMER.

APPLICATION FILED JULY 19,1920.

I I 1,422,205. Patented July 11, 1922.

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.recess in the shank 6. have its outer end squared to enable a turn- JOHN JULIUS JASPEESON, OF RANDXVIGK, NEAR- SYDNEY, NEW SOUTH WALES,

r m" t wi t idh.

AUSTRALIA.

EXPANDING- REAMER.

Application filed July 19,

Be it known that J OHN JULIUS Jesse-neon, citizen of Russia, residing at Milton, Earl Street, Randwick, near Sydney, New South Wales, Australia, has invented certain new and useful Improvements in Expanding Reamers, of which the following is a specificatlon.

. This invention relates to an expanding reame'r which is usable as a machinists tool in truing or enlarging openings orbores in solid metal work and which may be operated either by hand or by power. The openings operated on may be shaped either cylindrical or tapering. i I

. The reamer comprises a shank having a series of slots in each of'which a removable cutter blade may be securely held; a rotatable spindle having a conical shoulder at one end and its otherend screw-threaded and fitting a rotatable tapped sleeve one end of which is conical; a tapped collar secured to the said shank within which said sleeve may be rotated; springs fitting within the said shank adapted to position the cutter blades in the slots thereof; an end cover plate for .the shank; and backing plates for the cutter blades.

' Referringto the accompanying drawings which illustrate a reamer in accordance with the invention, Fig. 1 is'a perspective view of the reamer with the stem of the shank broken away; Fig. 2 a longitudinal section thereof; Fig. 3- an end elevation and part transverse section of the reamer showing the springs at the front end thereof; Fig. 4 a transverse section on line 4l& Fig. 2; F ig.5. a longitudinal section showing two blades of the reamer expanded .to cut a cylindrical openmg; and Fig. 6 a section similar to Fig. 5 but-showing the bladesexpanded to cut a tapering opening.

7 The body 1 of the reamer is recessed to carry a spindle having the conical shoulder 3 and tailportion 4 adapted to slide within the Such shank may 50f the spindle is screw-threaded and fits a 05 1 .tapp ed rotatable sleeve 8 whose inner end is Specification of Letters Patent.

1320. Serial No. 397,223.

provided with a conical shoulder 9. A tapped collar 10, which is secured to the body 1 by two or more screws 11 or other suitable means, carries the sleeve 8 with the front end 1 of the spindle therein. Said spindle is preferably enlarged at 12. At the heads of the sleeve 8 and the spindle respectively, nicks 13 and 14c are furnished to enable the former to be rotated by a screw driver or other suitable tool within the collar and the spindle within the sleeve 8.

cover plate'15 having an opening 2 is fitted to the front end of the body 1 by the removable screws 16. These screws fit tapped openings 17 in the body l. Such body has a series of slots in it in whichthe cutter. blades '18, having cutting edges 26. may be mounted. Theconstruction of these blades will be seen on reference to Figs. 2, 8 and t; they, are recessed at their front and rear portions to take about thecoiled springs 19 and 20, and their inner ends are also shaped to fit ,respectively about the conical shoulder 9 011 the sleeve 8 and the conical shoulder 3 on the spindle. One end of the coiled springs 19 abuts the inner front ends 21 of the'blades-18, whilst the other end of such springs abuts removable slide pieces 22, which areadapted to be mounted in slots within the body 1. The springs are carried in slots at the rear of the reamer, and their ends abut respectively the rear inner ends 23-of the blades 18and the screws'2 l. To remove a blade from the slot provided for ,it in the body 1 it is necessary to remove the cover plate15, the slide piece 22 and the spring 19 abutting it and the blade, and also the screw 24 and the spring 20 at the rear of the blade. The springs 19 and 20 serve to keep the blades 18 in position within the slots in the body 1. I

Backing plates 25 are also furnished for rigidly supporting the blades 18 in the slots understood that if the vertical edges of the plates 25 are made to extend outwardly from the clrcumference'of the body-1 blades of greater depth may be used in reamers whose es ar uot lim tQ rliam te When it is desired to expand the blades 18 in equal proportion from the circumference of the body 1 of the reamer for-the purpose of truing or enlarging a straight or cylindrical opening in metal, the pl ates 25 are first eased out'of contact with the blades. The sleeve 8 and the spindle-carrying the conical'shoulder 3 are then simultaneously rotatedby-means ofa screw driveror other suitable-tool whose working edge is brought into engagement-withthe nicks 13 andlt in the heads of said sleeve and spindle. Upon such rotation'the blades 18 {are expanded in equal proportion through the conical shoulders 9iand3 operating to force the blades radially outward which willbe seen on reference to Fig. 5 of the draw-' ings; If, however, it is intended to utilize the reamer for the purpose of truing or enlarging an openingwhich is to be tapering, itisonly necessary to rotate the spindle having the conical shoulder '3, when that shoulder will operate to expand the rear ends of'the blades 18 from the circumference of the body 1' against thetension' exerted on v such rear ends by the springs '20. In'Fig. ,6,

19 are also the reamer is shown with-the rearends of the blades 18 proje'ctingfurther .from the body 1 thanis the case with the front ends of the blades. Byrotating the spindleonly, its conical shoulder?) in forcing the rear ends of the blades 18 radially outward, conipresses-the springs 20, "whilst the springs slightly tated. Aftertheblades 18 have been expanded as required, the backing plates -25; are againsecured in contact with the sides of theblades. The working end of the screw driver or like tool may be inserted through the openingQin the cover plate 15,'and it is therefore unnecessary to remove that plate from the reamer when the blades 18' are to be expanded.

WhatyI claim as my invention, and desire to secure by Letters Patent is a- 1, An expanding. reamer comprising a shank .witha body, a rotatable spindle arranged in thebody andhaving a conical shoulderlat one end and screwrthreaded at the othergend, a rotatable screw-threaded [sleeve supporting thev threaded end of said spindlepndhavi nga conical shoulder,-a tapped collardetachably seeureclon the in 'terior of said body within which saidsleeve is mounted, a plurality of cutter blades adapted to be-mounted within, recesses in said body and to be expanded radially out- "w'ard jf'rom the circumference thereof {by rotating said spindle and sleeve, springs "mounted within said body and engagingthe tapped sleeve with. conical shoulder fitting compressed. The springs 19 and 20 are equally compressed vwhen both thespindlehaving the shoulder 3 andthe collar 8 are'simultaneously rofront and rear ends of said cutter blades to r position them wi huisaicl rbo dyt d eover plate for said body, and backing plates for said blades detachably 'atfixed to said body.

2. An expanding reamer comprising a body-having an end cover plate and astem with slot centrally thereof, .a rotatable spindle mounted within a recess in said body and carrying a conical shoulder at one end which end fits the slot in said stemand screwthreaded at its other-end, a tapped sleeve fitting the threaded. end a of said spindle, a collar 'detachably secured tdthe a tapped collar detachably securedto theinterior of said body, a slotted end cover plate ,for said body, slots in the forward end of said body adapted to carry slidepi'eces, a

plurality of cutter blades mounted within recesses ;in said body and capableyofbeing expanded radially outward from the circumference of said body by rotating said'zsleeve and spindle, coiled springs fitting'slotsin the front ends of said blades, whose ends T05 abut respectively said slide pieces and the inner ,end "of "said blades, coiled springs fitting slots in ;.the rear end of said body and abutting at their ends respectively with the inner rear ends of said blades-and with screws,.mounted in said bodyya ndbacking plates for said blades detachably secured to said body.

'4. An expansible reamer including abody "portion provided with acentral bore and 1-15 radial slots, radial movable "cutting blades mounted in said slots, resilientfm'eans arranged within thebody portion and engaging the ends of the blades for yieldingly forcing the same towards the axis of the body portion, and a plurality of inde pendently adjustable members mounted in said, bore and, engaging said-blades, the in dependent adjustment of saidmembers pei'-. mitting the expansion of one end ,ofkthe 1 25 bladesjindependently ofithe other end of-theblades. Y

5; An expansible reamer including albody portion provided with a centrallbo re" and radial slots, a plurality of radially movable 1 30 10 inner edges of the blades, said sleeve being provided with internal threads, and an axially movable and rotatable spindle mounted in said bore and provided at one end with external threads which engage the external threads of the sleeve, said spindle 15 being provided with a conical surface engaging the inner edges of said blades.

In testimony whereof I have affixed my signature.

JOHN JULIUS J ASPERSON. 

